I'm wondering the same thing, or if there is any way to set the sensitivity on the auto-on headlights? On my 2011 x5 seems that driving around sometimes in the daytime the headlights go on (can tell by seeing the little green light illuminate) to the left of the switch. Also sometimes when its late afternoon (but plenty of light) they go on as well... would like to adjust the sensitivity to less sensitive/responsive to darkness.